Improvement in feed mechanisms for sewing-machines



w, A.BURGES&

A Feed Mechanism for Sewing-Machines.

No. 204,533. mIPatented June 4,1878..

u NJETERS, PHOTLLIYHOGRAPMER. WASHINGTON, D. C.

. bar i is again pivoted at t".

UNITED STATES PATENT OEEIcE.`

ALBERT BURGESS, OF CAMBRIDGE, MASSACHUSETTS.

IMPROVEMENT IN FEED MECHANISMS FOR SEWING-MACHINES Specification forming part of Letters Patent No. 204,533, dated June 4, 1878 application filed September 17, 1877.

To all whom it may concern Be it known that I, ALBERT BURG-Ess, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented an Improved Feed-Motion for Sewing-Machines, of which the following is a specification:

The object of my invention is to provide a means, in sewing-machines, for simultaneously feeding both the upper and under surfaces ofthe material being operated upon.

The invention consists in certain details of construction and combinations of parts, as will be hereinafter first fully described, and then pointed out in the claims.

In the drawing, Figure 1 is a front-end view of a machine embodying my invention, with the face-plate removed. Fig. 2 is a side view of the same, showing some of the parts in section.

a represents the bed or support, at one end of which is xed the upright b, having attached to its upper end the horizontal arm b', through which passes the shaft c. On thc front end of the arm b is a head or frame, d, into which the shaft c projects, and upon the end of the shaft cis fixed a cam-wheel, e, having in its face a cam-groove, f, in which runs a roller connected to the feed-bar g, so as to impart to the latter the proper vertically-reciprocating motion. The feed-bar g reciprocatcs vertically in bearings g' g', forming part of a carriage, h, arranged at the rear part of the inside of the head d, and behind the cam- Wheel c. The shaft c, which carries the camwheel e, passes through an opening in the upright portion of the carriage h, the said opening being sufficiently large to admit of the horizontal movement of the carriage.

The reciprocating movement of the carriage h is effected by means of a bar, t', which is attached to the rear of the carriage, and extends through the arm b', being pivoted at i; then, turning down at the rear of the standard b, extends forward underneath the bed a, as shown, connecting at its front end by a loose joint to the under feed lc, which reciprocates in bearings la la'. The lower portion of the To the rear upper portion of the bar c is attached an arm, j, which extends upward and bears against a cam, c', attached to the rear of the shaft c, which moves the bar in one way, while it is held and brought back in the opposite direction by a spring, j; or the cam may be made to move the bar in opposite directions Without the aid of a spring.

It will be seen that, the continuous bari being pivoted at corresponding points above and below, as shown at t" i", will impart to the upper and under feed a simultaneous movement in the same direction.

To the face of the cam-wheel c is attached a friction-roll, l, which works in a slot, m, in a plate, m', one end of which plate is rigidly fixed to the needle-bar n. As the cam-wheel rotates, the requisite vertical motion is communicated to the needle-bar through the medium of this friction-roll.

o is the presser-bar, which is elevated by means of a projection, p, coming in contact with the end of the plate m attached to the needle-bar u, as the latter rises, the presser-bar being retracted by a spring, p'. The projection p is attached to a sleeve on the upper end ofthe presser-bar, and is capable of being turned so as to come into or out of Contact with the plate m.

The feed-bar gis made in two parts, connected together by means of a tube containing a spring, so as to render the feed self-adjustable to the varying thicknesses of material. The faces of the feeds are roughened in the usual manner.

The throw of the feed bars, and consequently the length of the stitch, may be regulated by simply varying the distance between bar j and the axis of cam c', which maybe easily accomplished by a suitable set-screw passed through said bar.

What l claim as my invention isv 1. The combination of an upper and an under feed-bar, the former being caused to reciprocate within a horizontal movable carriage, which is connected with the latter by means of a pivoted bar attached to the rear of said carriage, and extending to the rear, and then In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALBERT BURGESS.

Witnesses:

J. H. ADAMS, J. MELLEDGE FLAGG. 

